For high temperature curing cement additive material and hardened cement paste with this

摘要

PROBLEM TO BE SOLVED: To provide a high-temperature curing cement additive and a cement cured body using the additive for preventing reduction in long-period strength of a cement cured body and deterioration in physical properties such as durability even when high-temperature curing at 60°C or more is carried out for achieving initial strength or when unexpected high-temperature hysteresis is applied by hydration heat of cement itself such as mass concrete.;SOLUTION: The high-temperature curing cement additive is in a sol solution state wherein amorphous silica with a mean diameter of 10-500 nm is dispersed in a liquid phase. The high-temperature curing cement additive has an API value of 55% or more by the pozzolanic activity quick determination method (API method) and reduces an appearance period of a hydration heat peak in an alight phase in measurement of the hydration heat rate of cement to water by a microcalorimeter.;COPYRIGHT: (C)2012,JPO&INPIT